7-5e=9e-21

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Solution for 7-5e=9e-21 equation:


Simplifying
7 + -5e = 9e + -21

Reorder the terms:
7 + -5e = -21 + 9e

Solving
7 + -5e = -21 + 9e

Solving for variable 'e'.

Move all terms containing e to the left, all other terms to the right.

Add '-9e' to each side of the equation.
7 + -5e + -9e = -21 + 9e + -9e

Combine like terms: -5e + -9e = -14e
7 + -14e = -21 + 9e + -9e

Combine like terms: 9e + -9e = 0
7 + -14e = -21 + 0
7 + -14e = -21

Add '-7' to each side of the equation.
7 + -7 + -14e = -21 + -7

Combine like terms: 7 + -7 = 0
0 + -14e = -21 + -7
-14e = -21 + -7

Combine like terms: -21 + -7 = -28
-14e = -28

Divide each side by '-14'.
e = 2

Simplifying
e = 2

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